Lund's Last Call: is Walnut Creek "the Nut"? Plus a 49ers/Chargers recap with John Dickinson

John Dickinson and John Lund recap a 41-17 preseason Game 2 win for SF. The 49ers' running back situation is looking a bit more promising after a strong showing from Kaelon Black and Sincere McCormick in the team's latest preseason game. The duo impressed with their performances, leaving some to wonder if they could be the back answer to Christian McCaffreys. Meanwhile, the 49ers' wide receiver…